Electron gun positioning means



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ELECTRON GUN POSITIONING MENS Filed Aug. 20, 1943 2 Sheets-Sheet 2 y Snventors Gttomeg Patented Dec. 2, 1947 iJNiTED STATES PATENT QFFICE ELECTRON GUN POSITIONING MEANS Rudolph OLarte, Rego Park, N. Y., and Kurt Speck, Palisade Park, N. J., assgnors to Jacques Kreisler Manufacturing Corporation, North 3 Claims.

This invention relates to electron discharge devices such as, for example, cathode ray tubes.

One object of the present invention is to provide an electron-electrode formed of parts which can be easily manufactured and assembled and which are so constructed and arranged with respect to each other as to assure the correct position of the electron aperture in the tubular member and also to assure the correct positions of the apertures of the same electrode as well as of the different electrodes of the electron gun with respect to the other.

Another object of the invention is to provide an electron-electrode which can be made of sheet metal by simple cutting and bending operations and having parts which are so constructed with respect to each other that they can be assembled and secured in assembled relation Without requiring Welding of said parts to each other.

Another object of the invention is the provision of a cathode having the parts thereof constructed and arranged so as to facilitate the correct positioning of the electron emission element in relation to the aperture of the electrode.

Another object of the invention is to provide improved means for resiliently supporting the forward part of the gun assembly in the envelope or tube.

A further object of the invention is the provision of an electron gun assembly unit of improved construction.

The above and other objects, features and advantages of the invention will be fully understood from the following description, reference being had to the accompanying illustrated drawings. In the drawings- Figure 1 is a side view of a cathode ray tube embodying the present invention, part of the tube or envelope being broken away for the purpose of illustration:

Figure 2 is a View, on a larger scale, partly in elevation and partly in section of the electron gun of the present invention;

Figure 2A is a sectional view on the line 2A-2A of Figure 2;

Figure 3 is a perspective view, on a larger scale, of a part of the tubular member of the rst anode;

Figure 4 is a view in elevation, on an enlarged scale, of one of the apertured members of an electron-electrode of the present invention;

Figure 5 is a sectional view on the line 5 5 of Figure 4;

Figure 6 is a side view of the cathode;

Figure 7 is an end view of the cathode;

I of Figure 2;

- Figure 9 is a front view in elevation of the means for resiliently supporting the forward part of the electron gun on the envelope;`

Figure 10 is a sectional view of the line Ill-ID of Figure 9; and

Figure 11 is a sectional View on the line II--II of Figure 2.

Referring now to the drawings in detail, the cathode ray tube I0 comprises the usual glass envelope I2 and an electron gun I4 embodied in the present invention, said gun being shown by itself on a larger scale in Figure 2. As here shown, said gun comprises the grid I6, the pregrid accelerator I 8, the first anode 20, the second anode 22 and the vertical and horizontal deflecting plates 24 and 26 respectively.

One of the features of the present invention resides in the construction of the electron-electrodes I6, I8, 20 and 22, and more particularly the construction of these electrodes in respect to the tubular members and the electron aperture parts and the assembly of said parts with the tubular members and with respect to eachy other. This feature of the invention will now be described first With .reference to the first anode 20. The tubular member of said anode comprises two semi-cylindrical members 28 and 3&3 formed of sheet metal and connected to each other in tube defining relation. Each of said members is substantially of the construction illustrated in Figure 3 and as there shown is provided with the internal peripherally extending grooves 32, 34 and 36 in which are engaged the peripheral ribs 38 of the apertured members 40, 42 and 44 respectively. Said apertured members are formed of sheet metal and are of the construction illustrated in Figures 4 and 5; and are substantially all alike except for the size of the electron aperture 46. Said electron aperture is formed in the circular disc part 48 which is provided with an axially extending integral flange 5U which is provided with an outwardly pressed rib which constitutes said peripheral part 33. The disc part 48 is provided with a pressed rib 5I for reinforcing said part. Each semicylindrical part of the tubular member is provided with longitudinally extending outwardly directed flanges 52, the flanges of the companion tubular parts 28 and 30 being in close abutting relation for the full lengths of the tubular meinbers and being held in said relation by bending portions 54 of the iianges 52 of one of the tubular parts, here shown as the tubular part 28, over the flanges 52 of the companion tubular part, here shown as the tubular member 30. Flanges 52 of parts 28 and 30 are provided with lateral extensions 56 each having a semi-cylindrical groove 58 formed therein as illustrated in Figure 3. rI'he lateral extensions 56 providev means for securing the tubular member constituted by said parts 28 and 30 to the insulation rods 60 and 62, the latter being positioned in the cylin.

Thus, as

and the second anode 22 is provided with, the

apertured members 68 and l0, all of the same construction as that illustrated, in Figures 4 and 5 With the exception of the size of the central electron aperture 46. Further, it will. be understood that each of said electrodes I6, I8 and 22 are provided with grooved lateral extensions like the grooved lateral extensions 58 of the first anode 20 for securing said electrodes, to the mounting insulation rods 60 and 62. If desired, the confronting companion lateral extensions may be spot-welded to each other at opposite sides of the grooves for providing a good securement. of the tubular members of the several. electrodes respectively to said insulation rods.

It will be` understood that by reason of the provision of the peripheral grooves which receive the ribs 38 of the companion apertured members, the latter are automatically properly positioned longitudinally of the companion tubular members. during the assembly of said apertured members with the companion tube forming parts of the said tubular members, and further, it will be 0bserved that the apertured members are secured in position solely by the securement to each other of the companion tube forming parts of the tubular members, so that it is unnecessary to weld. said apertured members to the tubular members. Also it will be noted that the tube forming parts of the tubular members can be easily produced by simple operations such as cutting and bending,A thereby eliminating the necessity for forming the. tubes by the usual sheet metal drawing operation. The elimination. of the` welding and drawing operations is desirable as it obviates contamination of the. electrodes. It. will also be. understood that by constructing the electrodes as hereinbefore described the apertures of the gun are not only accurately spaced with respect to each other, but are also in correct axial alignment, this correct, spacing and axial alignment of the apertures being automatically and necessari-ly accomplished in the act of assembling the companionl tube forming parts` .with the companion apertured members.

The grid electrode Itl is preferably constructed as will now be more particularly described whereby the electron emission element. l2 is easily mounted within the. tubular electrode member and is held in predetermined position with respect to apertured member 64.. Said element 'l2 is constituted by a tubular member which is heated by the heating element 'I4 positioned therein. An insulation disc 16 is fixed to tubular member 12: near the closed front end thereof and is engaged panion integral portions 99 of member 96.

at its opposite sides at the peripheral marginal edge thereof by the spacing member 18 and by the member respectively. As illustrated in Figure 2 spacing member 'I8 is provided with a central aperture 82 which is in axial alignment with the aperture of member 64 and the front end of the, electron emission member 12. It will be observed that the forward end of spacing member 'I8 abuts the inner surface of apertured member 64 and that the insulation disc 'I6 which engages the electron emission member 12 in fixed relation thereto abuts against a peripherally continuous. shoulder formed in said spacing member between the opposite ends thereof. The peripheral edge of insulation member T6 engages the inner peripheral surface of the rearwardly extending tubular portion 84 of the spacing member 18, whereby the electro-n emission member 'l2 is positioned centrally of the tubular member of the grid electrode I6 in correct axial alignment with the aperture of member 64. Holding member 80 may be secured in position against the adjacent marginal edge of insulation disc 'i6 in any suitable Way as by a tight fit in tubular portion 84 ol' spacing member 78.

The insulation rods B and 62 are of tubular construction and are mounted on metal rods 86 fixed` at their opposite ends to the circular mica or other insulation discs 08 and 90 respectively, the opposite ends of said rods 8B being upset or riveted to said discs respectively. Disc 8S is supported within the envelope I2 by wires secured in the fused portions of said envelope at the base of the tube and secured to said disc at peripherally spaced points. The insulation disc 90 at the forward part of the gun is formed with a central opening 92 which engages around the tubular member of the second anode 22 adjacent the front end thereof at which the apertured member 68 is positioned. Said disc 90 abuts the peripheral rib 94 formed in said tubular member for the provision of the inner peripheral groove which receives the peripheral rib of said apertured member.

In accordance with the present invention, provision is made for providing a resilient abutment or support between the forward part of the gun I4 and the inner wall of the envelope I2. For this purpose the circular metal member 96 is secured to insulation disc 90 in any suitable way as by eyelet rivets 98 which are circumferentially spaced from each other and pass through com- The member 06 is provided with a plurality of circumferentially spaced spring iingers |00 which are relexed toward the base of the tube and resiliently engage the inner wall of the envelope I2. As shown, the spring ngers |00 are spaced outward from the peripheral edge of disc 90. The spaces between the radially extending portions of the resilient iingers |00 provide room for the connection of various wires and rods to disc 90 insulated from metal member 96. The metal rods 86 which extend through the insulation rods 60 and 62 are connected, as here shown, to two of the ears 9,9 by which member 96 is secured to disc 90.

The deilection plates 24 are mounted on rods |02 secured at their opposite ends to disc 90 and to an insulation disc |04. The deflection plates '26 are mounted at the ends of rods |06 which pass through disc |04 in fixed relation thereto and are secured at their rear ends to disc 90.

While. we have shown and described the preferred embodiment of our invention, it will be understood that the latter may be embodied otherwise as herein shown or described'and that in the illustrated embodiment certain changes in the details of construction and in the arrangement of parts may be made without departing from the underlying idea of this invention. Further, it will be understood that certain features of the present invention may be used without others. Accordingly, we do not wish to be limited to the construction herein specifically illustrated or described except to the extent which may be required by the scope of the appended claims.

Having now described our invention, what we claim and desire to secure by Letters Patent f the United States, is:

1. In an electric discharge device comprising an envelope and an electron gun mounted therein, an insulation disc Xed to said gun and spaced from the adjacent inner peripheral surface of said envelope, a member secured to said disc in face to face relation therewith in position surrounding said gun, said member being insulated from said gun by said insulation disc, and resiliently exible means integral with said member and positioned in the space between the envelope and said disc and resiliently engaging the inner surface oi said envelope.

2. In an electric discharge device comprising an envelope and an electron gun mounted therein, an insulation disc fixed to said part of the gun, a circular member secured to one face of said disc in position surrounding said part of the gun, said member being insulated from said gun by said insulation disc, and resiliently flexible means carried by said circular member and comprising circumferentially spaced radial parts spaced from said face of said disc and extending beyond the outer edge of said disc from points inwardly of said edge, said radial parts having 40 portions spaced from the outer edge of said disc and extending beyond the other face of said disc in engagement with the inner surface of said envelope.

3. In an electric dischargedevice comprising an envelope and an electron gun mounted therein, an insulation disc having a central opening in which one end of said gun engages said disc, a circular member secured to said disc in face to face relation therewith and spaced radially outwardly from said central opening, rods for sup- 10 porting said gun mounted in said envelope and having end portions passing through said disc and secured to said member, said insulation disc being spaced radially inwardly of the inner peripheral surface of said envelope, and resilient means carried by said member and resiliently engaging the inner peripheral surface of said en- Velope.

RUDOLPH OLARTE. KURT SPECK.

2 REFERENCES errer The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 2,060,825 Ressler et al Nov. 17l 1936 2,139,678 Glass Dec. 13, 1938 2,171,766 Ruska Sept. 5, 1939 2,172,205 Karl et al Sept. 5, 1939 2,189,874 Ziganke Feb. 13, 1940 2,202,588 Kniepkamp May 28, 1940 2,202,607 Steudel May 28, 1940 2,227,017 Schlesinger Dec. 31,1940 2,244,358 Ewald June 3, 1941 2,269,115 Koch Jan. 6, 1942 2,335,818 Trumbull et al Nov. 30, 1943 FOREIGN PATENTS Number Country Date 23,866/35 Australia Aug. 10, 1936 107,623 Australia June 2, 1939 

